The High Latitude Wide Area Survey (HLWAS) has long been a central element of the Roman mission. One defining goal of the HLWAS is to probe the origin of cosmic acceleration with accurate and extremely precise measurements of weak gravitational lensing and galaxy clustering. While the cosmology objectives set the survey's most demanding technical requirements, a survey that meets those requirements supports an enormous variety of science investigations. The in-guide survey, recommended by the ROTAC, consists of three tiers: a Medium Tier, a Wide Tier, and a Deep Tier. For cosmology, the Medium and Wide Tiers will yield measurements of ~6.2×10⁸ galaxy shapes for weak lensing, and grism spectroscopy in the Medium Tier will measure ~9.3×10⁶ galaxy redshifts at 1 < z < 2 and ~1.7×10⁶ galaxy redshifts at 2 < z < 3. The Deep Tier will provide the essential data for calibrating photometric redshifts and a wide range of shape measurements and spectroscopic incompleteness biases. (The parameters in the table below: n_eff is the weak lensing source density; N_shape is the number of galaxies with shape measurements; N_spec is the number of galaxies with secure spectral-based redshifts; n_spec is the comoving space density of galaxies with secure redshifts.)